Having a backup is certainly a good idea in any case - maybe you didn't break it completely... There'll always be the serial interface, and if you're very dedicated, you might be able to interface the eMMC chip...
But to emphasize this: there is no "internal SD", not in the sense of an accessible microSD card. It's an eMMC chip (at least, I guess so, as it is a chip and eMMC is what manufacturers use nowadays).
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